Die-stock.



H. W. OSTBR. DIE STOCK. APPLICATION FILED PBB.26, 1908.

965,320. Patented July 26, 1910 3 SHEETS-SHEET 1.

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- H. W. OSTER.

DIE STOCK. APPLIOA'IjIONEF ILED FEB.26, 1908. 965,320, Patented July 26,1910.

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DIE STOCK. APPLIOATION FILED FEB.26, 190v.

' 965,320. v Patented July 26, 1910" 3 SHEETS-SHEET 3.

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UNITED sria'rs OFFICE.

ING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

' To all whom it may concern:

Be'it known that'I, IIERMAN W. Os'rsn,

a citizen of the United States, residing at Cleveland; in the countyofCuyahoga and State of Ohio, have invented a certain new and usefulImprovement in Die-Stocks, of

' which the following is a full, clear, and

threadson a pylindrical piece, such for example as a pipe.

exact description.

" "This invention is a die stock especially contrived for the purpose ofcutting taper The objectof the invention is to provide a simple; andefiicicnt device vfor this pur- 2'1 pose, and one which may be veryeasily adjusted to work upon pipes of ditferent y nitely in .the claims.

"f fdiameters;

The invention consists in the combinations of parts shown in thedrawings and hereinafter described and pomtettout deli- "liiithedrawing, Figure l an end view rf'a die stock embodying the invent on.iig. 2 isa central long tudinal section therei of in the plane of line22 on Fig.1. Fig. 3 is a side elevation thereof. Fig. at is a sideelevation partly sectioned in the plane indicated by line Hon Fig. 1.

i Referring toparts by letters, A represents a tubular 'work holderwhich is preferably made of two parts, a, a rigidlyffixed together. Sinable means, as for example radial set screw K, may provide for clampingthis member onto the pipe which is to be threaded.

B represents the tubnlardie carrier which.

is externally threaded on its inner end, and

is screwed into the work holder. The pitch in place by a flanged ring hwhich is screwed into the end .of the member B. This cam has on itsinner face cam ribs (1,- which cuter notches'in the dies. There isnothing new about this ram plate or the parts directly associated withit, except as hereinafter described; that is to say, as to the cam plateitself, it is provided with a portion (l' which Specification of LettersPatent.

Application filed February 26, 1908. Serial No. 417,806.

, mounted on the work holder.

her B. Therefore the member Patented July 26, 1910.

overhangs the member B and has a hole d through it.

E represents a ring which is rotatively It must be incapable oflongitudinal movement thereonl It is preferably mountedgin an annulargroove which is formed between the overhanging flange (1. on the part aofthe Work holder. and the end of thepart (1 thereof. Pins ll secured tothis ring and lying parallel to its axis pass into holes Win the mem- Handthe ring E must rotate together; but the member B is neverthelesspermitted tomove 1011fgitudinally relative to said ring, as whenSZUCl'DIBmbOY-B is screwed into or out of the work holder.

. HERMAN. w. os'rER, OF CLEVELAND, OHIO, ASSIGNOR TO THE OSTERMANUFACTUB- G represents an arm which is adjustably,

. the cam plate and through thehole (i? there- 'in; This arm as shown isa straight rod,

set at an inclination which isa )prox'imately spiral; and the hole (itis snthclcntl elongated in a radial direction to enable tto do the workfor which it is provided. If this arm were formed and arranged in a truespiral, perhaps the device would work with greater exactness; but theconstruction shown is the cheaper construction and works in a thoroughlpractical manner. This rod passes throng an aieiial slot *e iii the rinE, in which slot said rod ma. be 'adjustahly fi'xed. This permits'theadpisting of thecam plate to the osition it should have at thebeginningof t e threadin o eration,-that is to say, theturning 0? t e.cam plate to adjust the dies to the work.

rod and the wedged shape washer m lies between the nut and ring so'thatwhen the nut is turned up the rod will remain in the inclined positiondescribed and shown. I

- It is evident that as the member By and ring I) are turned in thethread cutting 0poration the member B will be screwed into the workholder and willthereby move 101!- gitudinally relative to the workholder and to the ring I). The ring E turns with 1t and the cam plateturns with the r1ng,-'exccpt that, as the cam plate moves longitudinallywith member B, it will slip along the inclined rod G and will thereby beturned slightly relative to the member B. The'direction inwliich it isso turned that which causes or permits the dies to recede outward,

' longitudinally thereon,

and the resultis the cutting of a .tape'r thread on the pipe. Thisturning of the cam plate and conse( uent recession of the dies dependsupon the inclination ofthe arm G.

Having claim:

1. In adie stock, the combination of a tubular work holder, a tubulardie carrier,. the one screwed into the other, dies carried by the diecarrier and movable therein t0- ward and from its axis of rotation, acam plate rotatably mounted upon the ,die'carrier in engagement with thedies and having an extension which projects beyond said die carrier, aring rotatably mounted upon' the work holder but incapable of moving anapproximately spiral arm adjustably fixed to one of the two lastspecified members and projecting through a hole in the other, and-meansthus described my invention, I

which compel said ring and die carrier to rotate in unison. a

2. In a die stock, the combination of a tubular work holder, a tubulardie carrier, the one screwed into the other, dies carried by t the diecarrier and movable therein toward and from its axis ofrotation, a camplate rotatably mounted upon the die carrier in engagement with the-diesand havin an extension which projects: beyond sai die it, a rin carrier,said extension having ahole through rotatablymounted upon the workholder ut incapable of moving lon itudinally thereon, an arm adjustablyxed l to said ring and extending therefrom in an approximately spiraldirection toward' and -1nto the hole in the cam plate,and means whichcompel said ring'and die carrier to rotate. in unison.

3-. In adie .stock, the combination of a tubular work holder, a tubulardie'carrier,

I the one screwed into the other, dies carried by the the carrier andmovable therein ,to-'

ward and from its axis of rotation, a'o'am plate rotatably mounted 'u onthe die car- @1161; in engageinent with t eydies and" having anextension wl'iichprojects beyond saifd means preventing the longitudinaand die carrier to rotate in unison;

passing into holes in the 4. In a die stock, the combination of atubular work holder, a tubular die carrier, the one screwed into theother,,d ies carried by thedie carrier and movable therein 'toward andfrom its axis of rotation, a cam plate rotatablv mounted upon "the diecarrier in engagement with the dies and having an extension whichprojects beyomLsaid die carrier, said extension having ahole through it,a ring rotatably mounted upon the work holder, but incapable of movinglongitudinally thereon, the said ring and cam plate having the one anarcual slot and the other a hole, an approximatelyspiral arnr whichextends through said slot and through said hole, and means for clam )ingsaid arm' to the member containing salt arcual slot when the armis'atany desired position in said slot.

5. In a die stock, the combination of a tubular work holder, a coaxial"tubular die carrier capable of rotating and of moving longitudinallyrelative to the work holder,

dies carried by the die carrier and movable;

therein toward and from itsaxis ofrotation, a cam plate rotatablymounted u on the die carrier in engagement with the dies, acoaxia'hrotatable ring,'said cam plate and die carrier being providedthe one with an approximately spiral arm and the other with a hole intowhich said arm iiojects,

l movement of said ring relative to the work holder, and means whichcompel the ring In testimony whereof, I hereunto afiix m y signature inthe presence of two witnesses.

HERMAN W. os'rnn'. Witnesses: i

R. B. TEwKsBUnY,

A. S. GoULo'.

